Portion of a footwear sole



FIG. 1 is a perspective view of a portion of a footwear sole showing my new design; and,

FIG. 2 is a bottom plan view thereof.

The broken lines shown in FIGS. 1 and 2 are for disclosure purposes only and do not form part of the claimed design. 

The ornamental design for a portion of a footwear sole, as shown and described. 